My Boyfriends BM used her Daughter to get to me.

Sorry if this is long, I had to add a lot of context.

I (22 F) am in a serious relationship with my boyfriend (25 M). He brought two amazing little girls (6 & 3) into my life and I wouldn’t change it for the world. We have a very healthy relationship and are in the process of moving into a nice house with the expectation of having the kids during the weeks while they are with their mom (27F) on the weekends. Since the beginning of our relationship, my boyfriend would tell me about his children, we didn’t introduce me to them until we knew that we were going to move forward in our relationship and eventually get married. Since meeting the girls, everything changed for me. I got healthier and quit nasty habits, I spend lots of time with them, I even handle pick ups and drop offs from time to time since my boyfriend works a lot. Now everything is great in this aspect of my life and I wouldn’t give these girls up for anything as I see them as my own. The downside however is his BM. Since the beginning, she has often said nasty things about me to her children. She tried to ban my boyfriend from having the girls. She has stalked my socials and hacked my boyfriend’s socials to see my posts (after I had blocked her). Now if she had intentions of getting back with my boyfriend at some point, I would understand her obsession. The thing is, she also has a boyfriend who she’s been dating for a little longer than I have been in the picture. After she had found out about me, she admitted to my boyfriend that she’s using her current boyfriend to get over him (which we found very odd). She has tried everything to remove me from the picture like trying to get the girls to hate me (which she failed at) or sending “anonymous” tips that my boyfriend “cheated” on me (which isn’t true because we are together most of the time). She had gone to lengths of finding out who our mutuals are to get them to screenshot my posts to send to her. She tries to get information about me from his sister as well which never goes well for her since I’m loved by the family. His sister usually just relays the questions and comments to us so we can all laugh about it.

Now moving to today’s incident. We got his oldest daughter a watch with phone service so she can call us whenever she needs. Today I got an SOS notification from her saying she needed help. I quickly responded to ask what she needs to make sure everything’s okay. Since she’s young, she tends to send those frequently because she wants to talk. I then get a video call from her. I quickly answer and it’s her mother with her boyfriend on the line instead of her. It’s them just laughing and making fun of me which I was confused at first. I stayed on for a little bit in case but when I realized it was a prank I just hung up. I then proceeded to text my boyfriend about it which he said “I’m sorry” and told me to ignore it which I usually do. This is the first time she’s used her daughter for something like this but I know now that she’s not above it and that breaks my heart. I just wanted to vent about this somewhere to see if anyone has advice or similar experiences. If you’ve read this far, thank you.